There is a lot of free advice floating around the internet. Lots of questions we face have been answered by others! Here's my "greatest hits" of academic advice, organized by career stage.
For applying to / picking / and starting grad school:
How does a Ph.D. in Sociology work? by Anthony James Williams
Wait, should you go to grad school? Advice (and links) from Daniel Laurison
Tressie McMillan Cottom's Graduate School Guidance (with a focus on students of color)
Information on Minnesota's graduate training in Sociology
For current graduate students:
Want to work with me? Here's a guide.
Jessica Calarco's "Grad School's Hidden Curriculum" on Scatterplot
Neil Lewis Jr. and Jay Van Bavel's excellent workshop Demystifying the Academic Job Market
Mirya Holman's Checklist for Submitting Papers
For graduate students & assistant professors:
For students interested in non-academic and/or non-traditional careers:
Karen Kelsky's "The Professor Is In" Blog (see section on "Post-AC Help")